web/apps/scandic-web/components/HotelReservation/SelectHotel/SelectHotelMap/SelectHotelMapContent/index.tsx

"use client"
import { useMap } from "@vis.gl/react-google-maps"
import { useCallback, useMemo, useRef, useState } from "react"
import { useIntl } from "react-intl"
import { useMediaQuery } from "usehooks-ts"

import BookingCodeFilter from "@scandic-hotels/booking-flow/BookingCodeFilter"
import {
  BookingCodeFilterEnum,
  useBookingCodeFilterStore,
} from "@scandic-hotels/booking-flow/stores/bookingCode-filter"
import {
  alternativeHotels,
  selectHotel,
} from "@scandic-hotels/common/constants/routes/hotelReservation"
import { debounce } from "@scandic-hotels/common/utils/debounce"
import { BackToTopButton } from "@scandic-hotels/design-system/BackToTopButton"
import { Button } from "@scandic-hotels/design-system/Button"
import { MaterialIcon } from "@scandic-hotels/design-system/Icons/MaterialIcon"
import { Typography } from "@scandic-hotels/design-system/Typography"

import { useHotelFilterStore } from "@/stores/hotel-filters"
import { useHotelsMapStore } from "@/stores/hotels-map"

import { RoomCardSkeleton } from "@/components/HotelReservation/RoomCardSkeleton/RoomCardSkeleton"
import InteractiveMap from "@/components/Maps/InteractiveMap"
import Link from "@/components/TempDesignSystem/Link"
import useLang from "@/hooks/useLang"
import { useScrollToTop } from "@/hooks/useScrollToTop"

import FilterAndSortModal from "../../Filters/FilterAndSortModal"
import HotelListing from "../HotelListing"
import { getVisibleHotels } from "./utils"

import styles from "./selectHotelMapContent.module.css"

import type { SelectHotelMapProps } from "@/types/components/hotelReservation/selectHotel/map"
import type { HotelResponse } from "@/components/HotelReservation/SelectHotel/helpers"

const SKELETON_LOAD_DELAY = 750

export default function SelectHotelContent({
  hotelPins,
  cityCoordinates,
  mapId,
  hotels,
  filterList,
  bookingCode,
  isBookingCodeRateAvailable,
  isAlternativeHotels,
}: Omit<SelectHotelMapProps, "apiKey">) {
  const lang = useLang()
  const intl = useIntl()
  const map = useMap()

  const isAboveMobile = useMediaQuery("(min-width: 900px)")
  const [visibleHotels, setVisibleHotels] = useState<HotelResponse[]>([])
  const [showSkeleton, setShowSkeleton] = useState<boolean>(true)
  const listingContainerRef = useRef<HTMLDivElement | null>(null)

  const activeFilters = useHotelFilterStore((state) => state.activeFilters)
  const { activeHotel } = useHotelsMapStore()

  const { showBackToTop, scrollToTop } = useScrollToTop({
    threshold: 490,
    elementRef: listingContainerRef,
    refScrollable: true,
  })
  const activeCodeFilter = useBookingCodeFilterStore(
    (state) => state.activeCodeFilter
  )

  const coordinates = useMemo(() => {
    if (activeHotel) {
      const hotel = hotels.find((hotel) => hotel.hotel.name === activeHotel)

      if (hotel && hotel.hotel.location) {
        return isAboveMobile
          ? {
              lat: hotel.hotel.location.latitude,
              lng: hotel.hotel.location.longitude,
            }
          : {
              lat: hotel.hotel.location.latitude - 0.003,
              lng: hotel.hotel.location.longitude,
            }
      }
    }
    return isAboveMobile
      ? cityCoordinates
      : { ...cityCoordinates, lat: cityCoordinates.lat - 0.006 }
  }, [activeHotel, hotels, isAboveMobile, cityCoordinates])

  const showOnlyBookingCodeRates =
    bookingCode &&
    isBookingCodeRateAvailable &&
    activeCodeFilter === BookingCodeFilterEnum.Discounted

  const filteredHotelPins = useMemo(() => {
    const updatedHotelsList = showOnlyBookingCodeRates
      ? hotelPins.filter((hotel) => hotel.bookingCode)
      : hotelPins
    return updatedHotelsList.filter((hotel) =>
      activeFilters.every((filterId) =>
        hotel.facilityIds.includes(Number(filterId))
      )
    )
  }, [activeFilters, hotelPins, showOnlyBookingCodeRates])

  const getHotelCards = useCallback(() => {
    const visibleHotels = getVisibleHotels(hotels, filteredHotelPins, map)
    setVisibleHotels(visibleHotels)
    setTimeout(() => {
      setShowSkeleton(false)
    }, SKELETON_LOAD_DELAY)
  }, [hotels, filteredHotelPins, map])

  /**
   * Updates visible hotels when map viewport changes (zoom/pan)
   * - Debounces updates to prevent excessive re-renders during map interaction
   * - Shows loading skeleton while map tiles load
   * - Triggers on: initial load, zoom, pan, and tile loading completion
   */
  const debouncedUpdateHotelCards = useMemo(
    () =>
      debounce(() => {
        if (!map) return
        if (isAboveMobile) {
          setShowSkeleton(true)
        }
        getHotelCards()
      }, 100),
    [map, getHotelCards, isAboveMobile]
  )

  const closeMapUrl = isAlternativeHotels
    ? alternativeHotels(lang)
    : selectHotel(lang)
  const closeButton = (
    <Button
      variant="Primary"
      color="Inverted"
      wrapping
      size="Small"
      className={styles.closeButton}
    >
      <Link
        href={closeMapUrl}
        keepSearchParams
        prefetch
        className={styles.link}
      >
        <MaterialIcon icon="close" size={20} color="CurrentColor" />
        <Typography variant="Body/Supporting text (caption)/smBold">
          <p>
            {intl.formatMessage({
              defaultMessage: "Close the map",
            })}
          </p>
        </Typography>
      </Link>
    </Button>
  )

  const isSpecialRate = bookingCode
    ? hotels.some(
        (hotel) =>
          hotel.availability.productType?.bonusCheque ||
          hotel.availability.productType?.voucher
      )
    : false

  const showBookingCodeFilter =
    bookingCode && isBookingCodeRateAvailable && !isSpecialRate

  const unfilteredHotelCount = hotelPins.length

  return (
    <div className={styles.container}>
      <div className={styles.listingContainer} ref={listingContainerRef}>
        <div className={styles.filterContainer}>
          <Button
            variant="Text"
            type="button"
            size="Small"
            className={styles.filterContainerCloseButton}
          >
            <Link href={closeMapUrl} keepSearchParams className={styles.link}>
              <MaterialIcon
                icon="arrow_back_ios"
                color="CurrentColor"
                size={20}
              />
              <Typography variant="Body/Supporting text (caption)/smBold">
                <p>{intl.formatMessage({ defaultMessage: "Back" })}</p>
              </Typography>
            </Link>
          </Button>
          <FilterAndSortModal
            filters={filterList}
            setShowSkeleton={setShowSkeleton}
          />
          {showBookingCodeFilter ? (
            <div className={styles.bookingCodeFilter}>
              <BookingCodeFilter />
            </div>
          ) : null}
        </div>

        {showSkeleton ? (
          <div className={styles.skeletonContainer}>
            <RoomCardSkeleton />
            <RoomCardSkeleton />
          </div>
        ) : (
          <HotelListing
            hotels={visibleHotels}
            unfilteredHotelCount={unfilteredHotelCount}
          />
        )}
        {showBackToTop && (
          <BackToTopButton
            position="left"
            onClick={scrollToTop}
            label={intl.formatMessage({
              defaultMessage: "Back to top",
            })}
          />
        )}
      </div>
      <InteractiveMap
        closeButton={closeButton}
        coordinates={coordinates}
        hotelPins={filteredHotelPins}
        mapId={mapId}
        onTilesLoaded={debouncedUpdateHotelCards}
        fitBounds={isAboveMobile || !activeHotel}
      />
    </div>
  )
}